Celtic Music

[Ninjavenom]

I'm trying to gets me a hold of some celtic tunes, but the problem is that i don't know what exactly the type of music i am looking for is called. It's folky celtic stuff, but not like all-vocal or any of that. It's the stereotypical irish jig kind of shit, ya know? Like at the end of Boondock Saints, that kinda crap. Anyone know what it's called or who to start with?